On 10/17/07 09:48, David Abrahams wrote:
> on Wed Oct 17 2007, Larry Evans
<cppljevans-AT-cox-internet.com> wrote:
>
>> On 10/16/07 22:06, Larry Evans wrote:
>>> On 10/16/07 16:44, David Abrahams wrote:
>>>> on Tue Oct 16 2007, Larry Evans
<cppljevans-AT-cox-internet.com> wrote:
>>> [snip]
>>>>> But this would require the user to
understand the flags for all the
>>>>> compilers that are targeted. Bjam
saves the users this chore by
>>>>> providing a uniform name for all these
flags.
>>>> Doug's layer does that for any flags that
aren't portable in practice
>>>> (i.e. I don't think he did anything for -D
and -I).
>>>>
>>> You're right. I see it in the options call
below:
>>>
>>> http://svn.b
oost.org/trac/boost/browser/sandbox-branches/boost-cmake/boo
st_1_34_0/CMakeLists.txt#L51
>>>
>>> Thanks.
>> Hmm..., but how does cmake know what options are
valid for a *new*
>> compiler, such as Doug's variadic template
compiler.
>
> You need to code it up, just as you have to write
toolset code for
> BBv2. In Doug's stuff, IIRC, there's an imperative
if/then/else
> statement that checks the compiler and does the flag
translation. The
> really ugly part about this is that all the specific
info about every
> compiler we'll support is glommed together into one
file, so you can't
> just drop in a new file to add support for a new tool.
AFAICT, it's here:
http://svn.boost.org/trac/boost/browser/sandbox-branche
s/boost-cmake/boost_1_34_0/tools/build/CMake/BoostConfig.cma
ke
This code looks like the translation of some options (e.g.
the threading
options ) are just a function of CMAKE_SYSTEM_NAME, not
CMAKE_CXX_COMPILER. I'd expected the options translation to
also depend
on BOOST_TOOLSET, but maybe Doug hasn't gotten around to
doing that.
> I'm sure that
> can be overcome, but I it shows that Doug's code will
need substantial
> structural work before it is ongoingly maintainable as
Boost's build
> system.
>
Yep :(
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